/Engine/Source/Editor/AudioEditor/Classes/SoundClassGraph/SoundClassGraph.h
Display SoundClasses (and all of their children) that have been dragged onto the editor
void AddDroppedSoundClasses ( const [TArray](API\Runtime\Core\Containers\TArray)< class [USoundClass](API\Runtime\Engine\Sound\USoundClass) * > & SoundClasses, int32 NodePosX, int32 NodePosY )